References
- Ankerman , D. and Large , R. 1977 . Soil and Plant Analysis , Memphis, TN : A and L Agricultural Laboratories .
- Chavez , Eduardo . 1978 . Selected properties of four representative soils developing from lacustrine sediments of Lake Valencia , Venezuela : University of Florida . M.S. Thesis,
- Fehr , W. R. , Caviness , C. E. , Burmood , D. T. and Pennington , J. S. 1971 . Stage of development descriptions for soybeans, Glycine max (L.) Merrill . Crop Science , 11 : 929 – 931 .
- Gettier , S. W. , Martens , D. C. and Donahue , S. J. 1985 . Soybean yield response production from soil test and tissue manganese levels . Agron. J. , 77 : 63 – 67 .
- Soil Survey Staff . 1975 . Soil Taxonomy. A basic system of Soil Classification for making and interpreting Soil Survey 754 Washington, DC, , USA
- Solorzano , P. R. and Giral , H. Campos . 1984 . Produccion de Soya 70 Protinal, Valencia, , Venezuela